OPA628

The OPA628 is a low distortion, wideband operational amplifier. It features low differential gain error of 0.015% and low differential phase error of 0.015° at NTSC and PAL frequencies with a 150W load (a backterminated 75W cable). The 0.1dB gain flatness to 30MHz, and the excellent differential gain and phase make the OPA628 ideal for broadcast quality video applications. In addition, the spurious free dynamic range of 90dB makes the OPA628 an excellent choice to buffer the input of precision Analog-to-Digital converters.

It can also be used to provide a buffer for the output of precision high speed Digital-to-Analog converters.

The two-tone third-order intercept of the OPA628 is 60dBm.

The device is a unity gain stable, voltage feedback operational amplifier. It has all of the benefits associated with voltage feedback amplifiers including high input impedance, high common mode rejection, and symmetrical differential input flexibility. The unity gain bandwidth of the device is 160MHz. The low noise of 2.5nV/ÖHz and low noise figure of 9dB (RS = 50W) make it very useful in precision applications requiring wide dynamic range.

The superior distortion performance of the OPA628 is achieved by its multistage architecture which provides high open-loop gain. The distortion performance isadditionally enhanced by separating the power supplies to the input and output stages requiring four power supply connections as shown in the block diagram below. This separation of supplies eliminates the effects of package and wire bond parasitic capacitance and inductance. The device is powered with ±5VDC supplies for low power dissipation. The OPA628 is available in 8-pin SOIC package. The temperature range is 40 to +85.